Leaving Barreirinhas in a 4 × 4 vehicle that will take us to one of the ferries to cross the Preguiças River that gives access to the Lençóis Maranhenses National Park (PNLM), the park has approximately 155 thousand hectares. The trail takes an average of 35 minutes. At the foot of the dunes, we got out of the vehicle and started a walk of approximately 15 minutes to the Blue Lagoon or the best lagoon of the season where we will enjoy a delicious bath. Following on foot, in a walk of approximately 20 minutes, Free time for swimming. The lagoon circuit trail lasts an average of 1 hour, longer than the Lagoa Azul Circuit, but no less fantastic. In front of the Dunes there are support points where the cars will be parked, along with a guide we will start a climb to have access to Lagoa Bonita, right at the beginning of the hike. After that climb, your tiredness will no longer exist, as you will be impressed with so much beauty. Free time for sunbathing and swimming.